Hi it could be that the one instance has only recently subscribed, and so you will start seeing more posts going forward. Could also be an issue with your language settings. Did you select undetermined AND English? I believe that once you or someone from your instance has subscribed, then you see posts going forward.

I don’t know… lemdro.id and thegarden.land both have each other listed connected and both run lemmy 18.2

https://thegarden.land/instances https://lemdro.id/instances

It seems like they were either doing updates or server maintenance or something earlier today

Sounds like a question for both this instances owners and the owners of your accounts instance. Early days and issues like this are kinda a mess.